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#1
09-24-2008, 10:39 PM
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Over voltage protection relay
The tach on my '85 300SD has never worked, and the ABS light comes on after the car begins moving. It has been this way for as long as I have owned the car and I have tried to educate myself as much as possible as to the culprits.
I have found some material on this relay and am curious as to if it were bad, would all other functions tied to it be non-functioning? I found some posts mostly regarding SDLs dealing with the same problem: no tach and ABS light, but seemingly no other problems. I would really appreciate any help on this matter, thanks guys!
__________________
--------------------------------------------------- 1985 300SD 216,000 miles 
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#2
09-25-2008, 06:54 AM
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ovp
I had found the same problem on a friends 300td wagon 1987, the ovp can be repaired. It has a couple of solder joints that fracture and all you do is re-solder and everything goes back to normal. Why spend the $90 if all you have to do is use a nickels worth of solder and 3 minutes.
1984 300d Peter
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#3
09-25-2008, 11:16 AM
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I agree with the repair suggestion but will also note that new replacements are available for under $52.
Jeremy
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#4
09-25-2008, 05:18 PM
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I believe on my 87 300D when the OVP went, the AC stopped working also, in addition to the ABS light being on and the Tach not working.
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado
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#5
09-25-2008, 06:47 PM
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Check the OVP fuse first. Replace, if no change, get replacement OVP.
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1987 VW Jetta Mk II - Daily Driver 1992 W201 2.3 - sold 1985 W126 380se - sold 1985 W123 OM617.952 - sold 1981 W123 OM617.912 - sold 1986 W201 2.3 - sold 1979 W123 OM 617.912 - sold
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#6
09-27-2008, 10:12 PM
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where can one get a replacement ovp .
and where is it located? I am having a similar issue on a 79 300sd (116) and was wondering If i even have an ovp and if so where would it be located ??anyone know? Last edited by ob1 canola; 09-27-2008 at 10:32 PM.
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#7
09-27-2008, 10:43 PM
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Ovp
I did in fact repair mine by re-soldering. It lasted about 2 weeks, then died
again. I have lots of "junk" I've collected at garage sales, so I dug through all my boxes and found a suitable relay to gut to replace the open coil in the OVP. It took all day. I did give me a good understanding of how it worked and has been functioning fine for quite a while now. I probably just should have purchased a new one that plugs in in a couple minutes, however I kinda like to figure stuff out. Not when I'm doing it exactly, I'm usually irritable and ragey, but when it's done I get a really big WOO-HOO!! A feeling like no other  .
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85 300TD FED-Daily 84 300SD-Wife's 86 XJS-Sunday 66 GMC-Work- Given to my stepson 83 BMW Airhead- Given to my stepson
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#8
01-12-2009, 02:27 PM
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Just for people searching in the future - The OVP is located behind a cover behind the battery on the passenger side of the engine compartment. Remove the cover and you will see the OVP - Silver case with a spade type fuse on the top of it. Probably a 1" by 1" by 2" high cube.
__________________
05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado
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